Boësset's repertoire for high voices, transmitted by the precious Deslauriers manuscript, is the only surviving musical evidence of the religious output of one of the most influential French composers of the 17th century. Bearing witness to a miraculously preserved and somewhat mysterious musical world, this precious recording reveals a repertoire at once sober and poetic, which invites us into the gates of those convents that attracted a public enthralled by their angelic voices and animated by a single authentic faith that further increased the powerful appeal and mystery of their singing.